Quote:
Originally Posted by Half-Inch Stud
wires & hoses all the same.
Your question is all about the short-block. OUR answer will be based in your intended application. Being a Convertible doesn't decide 350/400. But the rear gear may.
If a 2-series (2.73:1, 2.54:1) then 400 engine. If 3-series (3.08:1, 3.23:1) then 400.
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8.2 Pontiac 10 bolt rears never came with 2.73's or 2.54's. Which rear & what ratio of gear one ends up running will depend on a myriad of things, no reason to saddle one's engine build choices to what Pontiac threw in a gray iron 8.2 ten bolt housing in your '71 convert. As a '71 LeMans Sport convert, if it was mine, I'd take the H092 dated 400 block have it ck'ed for worthiness, if no freeze cracks or major overbore, build this 73 400 up with a stroker crank, good forged rods & anything from a set of street-ported '71 96 casting d-ports to a set of 87cc alum heads. A build tailored for 500-550 ft/lbs of torque at around 3000 rpm, then have a 8.5 A-body built with a new Eaton & 3.08's. Should have a gob of torque & will not need a lot of gear, like if it was built as 406 with big valve high compression D-ports.