Help ??????? Can anyone please expalain why with a carb and dizzy setup the ignition timing will go to around 32-36 deg of total advance with a wide open throttle but with tpi (1227730 ecm) the total advance when the kpa values rise is taken down to around 20 deg???? .I am mapping out my ve tables but have noticed that the power drops off as the timming drops off,I have more power by lifting the throttle and bringing down the kpa,s.....?

engine is
350 sbc
with Edelbrock heads
10-1 compression
comp cams with 220\230\@50
Accel manifold base
ASM runners and ported plenum
Headman hedders
and 52mm throttle body.

I am hopping to get around 400hp from this setup (would that seem right to you guys)
Do I need to give it a lot more timing at the top end of the kpa vs spark map ????

many thanks IAN....