Hi, Jason, You may want to join the VCCA ( Vintage Chevrolet Club of America ). They have a active 4 cylinder group that goes on tours and have experts on the 4 cylinder to contact. If the 4 cylinder is too far gone you may want to check out the Merc Cruiser 3 Liter 4 cylinder out of sterndrives.( Still made today) It does not have a vacuum advance on the distributor, but it does have a mechanical advance, it is a over head valve engine. I am not sure what car engine it is based on, maybe the chevy II from the 60"s. Have Fun, Brian
