Re: Engine upgrade
From the perspective of an engine rebuilder, it is WAY easier to install a high-compression head at a later date than it is to install larger intake valves. If your budget is tight, opt for a new cam followed by the bigger valves. The high compression head can come later if you feel it is needed.
Worth noting, I personally feel the biggest bang for your buck in the performance department is camshaft. Then comes a high compression head. Using a Stipe IB330 camshaft helps the engine think it has more compression because of a tighter centerline (lobe separation) and adds torque to the lower RPMs. It also raises the lift from 0.287" to 0.330" advertised. Most reground Model-A camshafts have the torque band curve raised which does not allow the engine to pull well unless it is revved up. That was not how the Model-A engine was originally designed.
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