Good news!!! The 261 that I found recently is a go. Plans are for a .040 overbore on the block, some mild bowl work on a 235 head, a vintage McCulloch supercharger, the current EFI system (reprogrammed for the blower), and a blower friendly hydraulic cam. The goal is to maintain or slightly increase torque way down low and build max torque at 2500 RPM which is cruising RPM at 75 MPH. Maximum blower pressure will be 5-6 PSI. With the 3.90 rear gear, gear vendors O/D, and 31" tires the truck struggles at freeway speeds when a hill and/or a headwind is encountered. Since I live in the land of 75 and 80 MPH speed limits I hope this combo will allow the truck to cruise more easily at those speeds with some reserve to handle the hills and wind and possibly tow a trailer. I hope to start building the engine in the next couple of weeks.
