point of reference, in my 3950lb 5th ave, I had an LA 360 with a comp XE262 (~8:1) compression, 3.55's, and a MP166k converter that brake stalled to ~23-2400, flashed to 2800. moved the car along just fine. would light them up at will.

switched to a magnum headed 318 with a 259/259 roller, .506" gross lift, using hughes #1110 springs and stock magnum rockers. has the same power as the 360, would prefer the MP166k converter, but lives with the stock, low stall (~1400rpm stall) converter because of a crack I found in the snout of the 166k.

you'll be fine with the stock magnum rockers, GM3.1/3.4L springs or the hughes springs w/2.2L retainers with the gear, stall, & weight. with headers, it'll be a low-mid 14 second car, maybe even nipping into the 13's.