My question is, why flat tappets? You can get a roller setup for about the same price, with almost no chance of failure, and no break-in required.
It looks nice. Did you check out the possibility of using a Fitec, or Holley TBI? They cost a bit more, and no tuning necessary.
Did you check for the distributor fit? It looks like a gen 1 engine, or at least heads. You may have to bore the intake manifold out to accept the shorter distributor to clear the cowl.