Another thing you may want to think about is hood clearance.
The 351 has a taller deck height. You might need a cowl hood. When I had my stock hood on my '82 I had the hole cut out for the factory scoop. I don't know if it would have fit or not without that hole. Now I have a fiberglass hood with a 2.5in cowl and that works ok.
I would also immediately get subframe connectors if you haven't already.
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'82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.
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