Bought a 48 Plymouth with a 1982 chrysler 318 engine with a 727 automatic trans. Car has $14,000 invested to date but I want to swap out to a better engine. Due to the fact drivetrain was custom built I want to keep same trans if possible. If not will re-do driveshaft. Any imput would help. Due to the economy money is tight so please keep this in mind. Thanks for all imput.