I would be very carefull full welding the seams on the subframe. Heat will warp the you know what out of it, and it will provide very little benefit except looking cool all smoothed. If you do weld it up solid, do it in stiches 1 to 2 inch at a time and bounce from side to side to allow cooling beween welds.
As for mods, IF your using aftermarket control arms a simple re drill of the upper control arm mounting holes on the subframe below the factory holes will improve you camber gain. And a set of geometry corrected control arms will increase caster.
A good set of coil springs like Hotchkis, some good shocks (Hotchkis are great NON adjustable on a budget, A hollow sway bar (Hotchkis again) and a 600 steering gear, some tie rod stiffeners, and you have a really nice frame for $2500!
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Frank Serafine
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