Blower Boost?
The 1st thing i see,is your Biggest Problem?
CAST CRANK???
If it was Me,a Forged Crank would be the #1 thing to start with!Then a set of Good Forged Rods,your Pistons seem alright?
I know some of you Guys are going to say,i have used a cast Crank with No Problems?But,when that Problem Starts,you Cant Stop!
Later
G 8)