[J. Cooper]

4dr 66 nova with a near dead 250 stock engine a stock PG 2speed ,and stock rear gears i dont konw what they are. I'm new to this (working on car).
I want a engine with O.K. gas milege and sweet torque here are the choices:
Stock 350,PGtrans,3:08or 3:11

Stock283 " "

Stock305 " "

Any info or suggestions will help greatly

[CAD]

As the saying goes, there is no replacement for displacement. This means bigger cubes. Gas mileage is primarily affected by lead in foot (like me). If you use a small carb like a 600cfm vac sec Holley, you will be able to get good mileage.
3.08 is prob what the rear is. You can get close by jacking rear end up in the air, spin the drivers side rear tire one revolution and count the rotations of the driveshaft. This will help determine if you have 2.73 or 3.08s. Also, you wont realize much torque with a pg and 3.08s. A th350 trans will significantly change the way it takes off. My 68 camaro had a pg with a 327. It's best ET was a 14.70. After I switched to a th350, it was running 14.00 ETs. Quite a difference. And that was with a 2800 stall in the PG and the th350. By the way, the torque converters for a stock PG and a stock th350 do not interchange. It will assemble fine, but it will not work....
Also, that 250's cylinder head may be of value to guys with older boats with a straight six. I had a guy begging me for the one I had a long time ago. So, ask around before you dump the engine.
CAD

[J. Cooper]

Thanks for the info .

[crazy larry]

i'd go with a 283 or the 350. i had a 305 once, just not as robust as the 283 or the 350......... and like he said, theres no replacement for displacement.......