Help/Input needed

[81ShrtBox]

I recently did a Vortec swap in my 81" Shortbox.

99" yukon heads on a 96" suburban block(heads decked, valves polished, new seats, lil-pocket port clean up)
Beehive springs
Will Hoites 270 Roller cam .495 intake .218@50 and .502 exhaust .224@50
thin head gaskets
Headers
Summit Race mufflers with 2.5" pipe slight angle before rear end
KMJ Performance 65,000volt HEI distributer
Edlebrock 750 vac sec
ebay Performer RPM replica intake


trucks drives and runs great, the Will Hoite camshaft sounds mean as hell. But when I get on the gas it jumps forward then falls on its face... does a means burnout... just cant get the dam thing to perform.

It acted better after I replaced the stock distributer, but still isnt 100%. I'm changing the fuel pump, and then the roller lifters are next( I re-used the old ones). I have tried changing to platinum plugs, carb is like new... even checked to make sure I had 12v to the coil...I'll try changing the alternator because i want everything new anyway... if the fuel pump and alternator dont change the problem I'm yanking the engine and starting over with another combination...

This one will be Competition Cams, MSD Electronics and an Edelbrock intake... I looked at alot of different reviews with people having excellent results with this same combo(est400hp/380-400ftlb torque... but its giving me the blues