The truck engine will need a lot of modifying. They were buit for torque not power, the heads are not built for a performance car perspective. I have a Built 402 in my 71 SS Elcamino but it came out of a 70 Chevelle. It allready had 10.5:1 copression and the hi performance heads (I completely rebuilt it with aftermarket parts, new cam, intake, carb, and rebuilt the heads with roller rockers, 3 angle valve job, harden seats, and new valves).
It would be a great motor to get however you will have to go completely through it (New pistons, cam etc...) and add different heads to get any serious horsepower.
00 SS Camaro,6mt,NBM,SLP lid and Bellows,Ceramic LT's,ORY,Borla adjustable,STB,SFC's,LCA's,PHB,TA, 35 splined 9" w/ 430's and Locker, Strange D.S., Pro 5.0 W/short stick, PRC Stg 1.5 Heads, TSP 230/232 604/604 Cam, Fast 90, PTM 90 TB, Spec Stg 4, MT ET Streets for the track
71 SS Elcamino,Built 402 BB with all the goodies,TH-400,3500 stall,12 bolt 3.73 Eaton posi.