Thanks for the replies, guys.
Turns out to be head gasket. It was the timing of it happening at the same time that threw me off. Guess I'll be pulling those World Product heads.
After much searching and googling I couldn't find the answer so I'm asking for help.
Just bought a 1986 with dual tanks. Previous owner had an electric fuel pump (Holley type with bypass) installed after tanks and pressure regulator under the hood (1 in and 2 outs). There is an inline...