I'm in the engine rebuild stage for a B20E in a 71 P1800E. I wanted to get a B20F head for port modifications but they seem to be somewhat scarce. If I have the engine over-bored .030 and use a little more aggressive cam am I going to waste the money/cause a burp until I can get a F head. I'm using Megasquirt for tuning. Is the E head worth having additional port modifications or just hardened seats, 3 angle grind, and simple cleanup. I would like to hit about 150 HP.