thank ffr428. i got into the crank last night and the only markings i found on the crank was 2u on the 2nd or 3rd weight.it must be a 390 , ill check the cyl tonight. i was thrown off by all the diffrent casting numbers , on on cyl head by the plug hole has 21 and the letter w and the other has a 5 and the letter e.there is also a large 2 above the casting number on the block. the a is on a milled ear that looks as if it was used to hold the block during assy. just above the starter and it can be seen with the engine in the car