Flexplate Question 1991 305/5.0

:) [B]I am putting a 305 /5.0 engine from a 1991 Camaro into my 88 G20 Van ...I am replacing the worn out 350/5.7 that came with the van ... Can I use the same Flexplate or as some call it "Flywheel" that was on the 5.7 ? I was told to be careful about this because some engines are balanced differently ? Everything about these engines SEEMS to be identical except for the cylinder bore both are single piece rear main seal engines ... I don't want to put my van all together and then find I need a different flexplate ? and I don,t know how to be sure I got the right one ? I am going to post this on the VAN forum too ...THANKS EVERYONE ! BOB