RE: need help with motors
The .26 cubic inch is a big block motor. The 2.5 is actually just a .15 cubic inch motor. Its a small block, and will not fit in place of the .26 or be nearly as powerful.
Whay are you wanting to put a 2.5 on it? They are good motors for their size, but i dont think it would be near worth the trouble. Are you just wanting a good motor for cheap, or do you have a 2.5 already and were wanting to do this?