[eric8]

Another fun fact....I have always heard the benchmark that a TH350 tranny will need rebuilds at least every 60,000 miles. Well my original tranny in my 72, two owner c10 had 125,000 miles, with 20k of those being behind a 345 hp zz4 crate motor before it finally $hit the bed, so every case is different. But there's no arguing an old Gen 1 sbc doesn't hold a candle to lasting even half as long as a gen 3 or gen 4 GM V8