Edit: Just realized that I posted this in the wrong area... I've reposted here. Mods, delete this thread please.

First off, I searched for an answer ("350 swap" and "305 350 swap") and didn't find one, so I posted this.

I have an 1985 Trans Am with around 135K miles, and the 305 is starting to die. I have a '56 Chevy shortbed project truck that I bought 6 weeks ago, and it has a freshly rebuilt 350 4 bolt main mounted up to a TH400 tranny. The truck is in the middle of a ground up resto, and I will be selling it (won't get to it for another 3 years or so, and it's taking up space in the garage... bummer) but I thought I could use the 350 that's in it and drop it in my Trans Am instead of rebuilding the 305. Are there going to be any issues mounting it up to the TPI intake or the auto tranny? I'm not sure what year the motor is, but all I know is it's a 4 bolt main. Is there a way to find out if it will work with my 700 without taking it out of the truck to see if it will fit?

Also, with the current prices of gas and since this is a daily commuter, how much gas mileage will I be getting with the 350? I'm getting around 25 MPG on the highway with the 305, and I friend of mine says he's gets around 23-25 MPG on the highway with his 350/auto, but with the 45 cubes difference, I find that hard to believe. Does anyone else get that much?

Thanks!

 

The TPI, tranny and EVERYTHING will bolt up exactly like it does on the 305.

You may want to pick up a set of injectors from a 350TPI and a chip (or computer) from a 350 TPI car. Other than that it will all work fine.

 

the 700 will bolt up fine. milage depends on the setup and how often you apply thy foot into a horizontal position.