Hi Paul,
It might be the heat shield you need then When I first had my GTO's 389 built I had that problem until I added one. One night after leaving my girlfriends house at 2am I got pulled over by johnny law and I had to walk home cause the Goat wouldnt start back up.
You say the engine is 180 degrees when you go to start it back up? 180 is normal. With the Ford setup how are you routing the positive cable to the starter motor? . Cause after I added the shield and added heavy gauge battery cables, I had no more problems.
-Don
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1966 GTO
1966 421-10.1-1 comp-Race Tec 23cc Pistons
KRE Tri-Power
KRE 65cc Aluminum Heads
XE274 cam by Comp Cams
DUR 230 Int 236 Exh @.050 - 110 LSA
LIFT .491" Int .491" Exh
Tri-Y-Headers by Tribal Tubes w/ Goerlich Mufflers
1966 Muncie Wide Ratio 4-Speed
1968-72 Chevy 12 Bolt Rear End w/ 3.73 rear gears