Adjust valves

Not really your question, but for a daily driver you might prefer switching to hydraulic lifters so you don't have to regularly adjust them. I did so in my 1965 273. I installed an "RV Torque" camshaft and Rhodes leak-down lifters. Rhodes give a similar effect as VTEC in current engines. I bought shorter pushrods, I recall ones for the special 340 RT engine (~1972) fit and the adjustable rockers made setting pre-load on the lifters easy. I also set the cam for 4 deg advance for better mileage, low-end torque and to account for wear. Posted w/ photos years ago. Only driven the car once since, so can't comment and just theory for now.