Are the engine blocks different due to hydraulic vs solid lifters? Or are they interchangeable?

Also, I would like sometime to get clarification maybe from Dave about this harmonic balancer size issue. The rpm of the fan is the issue, but I am wondering if that is a severe issue, a likely okay issue, or what?


Deve

1950 Chevy 3100 Deluxe Cab
1950 Chevy 3100 Standard Cab
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