holly carb issues???

the carb in question is a 770 avenger vac secondaries.

the engine is a SB 410 cid, xe274h hyd flat tappet cam 4in stroke and 4.04 bore

ported 2.02 and 1.60 valves cast iron heads eddy rpm air gap intake.. long headers.. auto 904 in a dakota with 355 gears



the carb has 72 jets, and what looks like a 8.5 pwr valve.



the truck idles like crap.. its rich and plugs are blk. and my eyes burn.

i have approx 14-16 in vac..



now do i need a pwr valve that has a lower in number?



and are the jets a good starting place? or should i change them while its apart?



float level? should the float be level when looking at the back side of the bowl? where is a good place to set the leval at since its apart?



and the idle mix screws. 1.5 turns a good starting point as well?



any other tips or suggestions while its apart?



any one use percys adjust a jet?

Timing is set approx 16