Is a 1970 ford thunderbird easy to fix up?

I've found a pretty good deal on one but it's missing motor and tranny. I've found those too, but I was wondering how hard it would be to do this. Also, is it possible to put a 2005+ drivetrain from say an impala or mustang or something in it? I want it to be so I have to fix it less. Don't worry, not changing interior or anything. Just the stuff under the hood.

How hard depends on your skill level as a mechanic. If you've never done it before, it can be a real challenge.

The technology in an early 70's vehicle is very simple compared to modern vehicles but if you want to install a modern drivetrain, I would stick with a rear wheel drive platform donor vehicle. The Impala is a FWD vehicle.

If you decide to go that restomod route ( RESTOre a vehicle with MODern technology ), be prepared for a lot of fabrication. You will need not only the engine and transmission but all the associated electronics and wiring to make it work.

Any modification is possible providing you have unlimited money and time. You'll need to check out how much aftermarket support you have for your idea. If you don't have much aftermarket support, you'll need to fabricate a lot of parts.

" 2005+ drivetrain from say an impala"

The 2000+ Impala is front wheel drive. The T-Bird is rear wheel drive. Probably not going to work out well.

"or mustang "

Doable, but not the best choice IMHO.

Your car came with either a 390, 428 (both FE blocks) or a 429 (probably doesn't have this one as it's rare engine), which is a 385 block (that's the name, not the displacement). All of these engines fairly rare (390/428) or very rare (429) today. What I would do is get a fuel injected crate 351W backed by a built AOD, even a pretty mild one will get you 300+ HP and 350+ lb/ft of torque. Change out the rear end gears to something like a 3.55 and you'll have plenty of power and with overdrive, you'll have low RPM's on the highway. Everything should fit easily, You'll have to get a new fuel pump, and new motor mount, and you might need a custom driveshaft. But it should provide you with more power, better fuel economy, and solid reliability, vs. The stock engine. With that said, if the stock engine is in good shape, there's no reason to replace it.

All new body-on-frame design introduced for the '67 T-Bird and used thru '71… Also shared by '68 thru '71 Mark III Continental. Relatively trouble-free boulevard barges… Long-lived big-block engines and transmission… Big hefty disc brakes… Most modern conveniences (except air-bags, anti-skid etc). Problem areas: horrendous gas mileage… Hideway headlamps on '67-69… Sequential turn signals. Relatively rust resistant except where salt is used on roads (watch the "dog legs").

I had a '67 and a '71… Wish I had kept the '67 4 door and I still cruise the ads hoping to find one I can afford. I would keep it as all-original as possible. They are heavy: no matter what engine you put in, it's gonna use gas: I got about 14 mpg on highway and 9 in town. If you kept period-correct engine/transmission (they were designed to move a 5000+ lbs car unlike any transplant) I would just suggest going to electronic ignition and update the AC (and hardened valve seats if the engine is ever opened-up) … And you'll have a cruiser that's more comfortable and quieter than anything made in the last 30 years. Since they changed so little in 5 years of production and share so many bits with other Fords and Lincolns, parts are not a problem.