is there a list somewhere of factory casting numbers? i have a few stock style intakes Id like to figure out what they were originally on. i do have a square bore cast piece that i was told was 68-69 340 but Id like to check the numbers..I do think the lD 4b was 273 318 specific and the LD 340 was wells elf explainatory. the bolt patter aside I agree any 318 intake owuld fit.