Stop in for a cup of coffee

Engine numbers are right behind the timing cover on the block's front china wall. You can go to hothemiheads.com and look up the numbers. That's the smallest physical size of the early Hemis. It would fit good in an early A. We have more than one member who put early Hemis in their cars, one was a 354 in a 65 Valiant 2 door. The Chrysler motors are pretty big though. The little Dodges like you have are a better fit.