by now you no doubt have the answer bot there are only 2 v8 in an 86 cutlass a 305 chev engine and a 307 olds engine, because you described the...
sometimes when doing a valve job on an older engine the new compression can create new/more pressure on the bearings causing them to ware...
I agree with 78subgeorge unless you had a surefire plan why reinvent the wheel? 350 blocks are everywhere but if you want torque how about a 292-6cyl.
get me the numbers behind the drivers cylinder head at the belhousing mount
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