They look good from the specs. GM used on the 250/292 from 74 on. Someone posted that you can get a rebuilt from your FLAPS for about $90. I bought a adjustable vac adv for my HEI. Regardless of how I adjusted the vac adv, I still still had to install the limiter that came with it it. Bronze gears are only(?) required for high spring pressures.
Larry
