Started my conversion. Need Help. Please

[chadapcb]

No I have a modified boat chip for my 7747.

Also little more info.

My tbi has a modified FPR. I have it set at 20 psi and it still doesn't want to run. But as soon as I block return then it jumps to 26 psi and runs good.

Confused on where to look.

FPR is maxed out at 20 psi.

[chadapcb]

Ok just a good ole update. And maybe it will help a few ppl.
The normal small block Chevy loves 12-13# fuel pressure
The vortec series requires 26-30# of fuel pressure.
So if you switch heads and run vortec heads you are and you will bump up the fuel pressure. Currently running 28# of fuel pressure.

engine timing. 12 degree before TDC idle at 750. Marine application has to be a little higher.

Ty to everyone that offered help.