I know you went to a lot of work to make your flex plates, and I'm not knocking them. I just use a 6 and an 8-bolt neutral balanced flywheel and a bellhousing for an LA and B engine. If I need to, I bolt weight on for cast cranks. I have an older factory Denso starter with the snout cut off, and it works fine on either one. Snout was cut so that it worked on my RB/Powerglide set-up. I do have a Chevy starter and ring gear laying around, also.