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Haven't been able to find casting no yet but the no stamped on the block below the alternator is 1m1226 with a stamping below that of IVP. Based on the small block Chevy engine code the 1m stands for a 1969 350 - 255hp with 9.1 compression. My compression readings are 4@135, 2@138 and 2@140 which coincides with the published CR.
Head stamp is 83417369, Hencho in Mexico. I believe these were used with gm crate engines and have 1.94" intakes and 1.50" exhaust.
I really have no idea what the cam is other than its aftermarket and has a moderate lope at idle.
Hope this helps and thanks for the suggestions on intakes.
It was SWMBO's little dog. .
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