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I would suggest a 403....the saying goes there is no replacement for displacement......I have seen quite a few 403's on Ebay.....a lot of Pontiac trans am's had this engine in them if ya are hunting junkyards as well as 98's from 1977 to 1979......some trash the 403 as being weak.....mostly because it has so called widowed main bearing webs.....there are cutouts in the block area above the crankshaft bearing slots.....the 350 engines were solid there....for a warmed over street engine the 403 will hold up just fine.
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