I had that same motor back in the early 2000’s with dual blue sudco 38’s and a ocean pro head. I dont remember if the head was pp spacing or SX spacing but you need to ditch that stock head for a aftermarket one. Westcoast used to make on with removable domes so you could change the compression. I was running 195 compression with AV gas.
All i can say is that setup was one of the hardest pulling/fastest setups i ever built! Running a straight 15 skat in a 550 pump it was like a light switch.....on or off! Gave me tunnel vision! I think i was running a PJS full pipe, manifold and head pipe.
If i was you I’d hold on to that! Get the parts you need over time and build it! You wont regret it!
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