Revod, do you have aftermarket lifters or stock? aftermarket use only 1/4-1/2 turns depending on brand. maybe running out of travel.
I would think you need more timing 36-38* total
I don't think you need any boost ref. pv or vent tube ext. at such low boost even to 15-20#
Try smaller plug gaps .025
6# fuel pressure (reg will increase boost amt. and engine will still think it's 6#)
Use 2.5 powervalve !!!
Take on highway and read plugs
Do you know exh temp, if high could be timing.
Check float level, high float can make richer, pulls over to easy.
Also 3# boost is not much, raise boost to lean out, if spring will not go higher use a reg to gain boost.
Check plug wires.
Harry
