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As noted above, the Pontiac is a good choice. The trans SHOULD be a Muncie in the GTO, but after 30 years, who knows? Most Ponchos have cast rods rather than forged and the large bearing diameters make for high bearing speeds. Accurate machining and assembly, studded mains and ARP rod bolts will let the 400 live to 6500 rpm, but more than you want/need in your truck.
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44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
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