After being scammed by a quote reputable FE guru with a Dyno Time-only cracked block motor, I located a 406 cross-bolt main and started building. Survival Motor Sports heads, Diamond 41302 pistons, comp cams 33-244-4 solid cam 244-244,540 lift. The engine is 30 over and the crank is a 1U cut 10, Harlen Sharp rocker assembly with end stands. Here is the problem after assembly by my engine guy, who is a FE guy, the valves are hitting the pistons. Double-checked everything. What am I missing??