I wouldn't do a twin cam in a hard body. I'd go all out w/ a tri cam. Those things are beastly. Stock block puts out an easy 363HP and believe it or not, the torque is 413 foot pounds. I'm putting a dry dump oil pan on for a reserve when mine comes in, (just bought a block last week for $500) for added heat consolidation. Sweetness!
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You know, somebody actually complimented me on my driving today. They left a little note on the windshield, it said 'Parking Fine.'