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There are a couple ways to tell short of tearing a head off the engine and measureing a cylinder.From the factory in the 80s a 305 timing pointer was at the 12 oclock om the balancer and a 350 was at about 2 oclock.Also on the back of the engine where the trans bolts to on the driver side behind the head the 80s engines would be cast in 5.oL for the 305 and 5.7L for a 350.These arent always sure fire ways but alot of times its worked for me the only definite way to tell is pull off a head and measure the bore the 350 is a 4inch bore

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13y ago

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