Beginner Road Track Racing: Feedback on Engine Options Wanted

Look up SVRA which is a vintage racing club kinda like NASA or SCCA. They host races all over the states and have groups for vintage T/A style cars. The issue some times with some clubs is if the car does not have any racing history and/or was not raced in period with a log book the car won’t be accepted to run. Not saying you can’t build and run the car with some local track day clubs, but if you were trying to get into events like Monterey Rolex Reunion, Brian Redman challenge at Road America or such events, your car would be skipped right over…. As many on here know, racing takes money anyway you look at it. Tires, gas, travel, entry fees, broken parts just to name a few….