There is no ignition kit thats makes spark plug maintanince non existant. It would be nice though...
Look for a 96-01 vortec 350. 4bolt mains, vortec heads, roller cam, 9.3:1 compression, 300hp and 380lbs/ft stock at the crank. Also runs on 87octane once you get the ignition curve right. I have one in my 79 and even with 3.07 gears it will light em up on command and scratch the tires going into 2nd [but you'll need a shift kit in your tranny for that to happen]
I got mine with 3000miles from a warrenty replacment for $900. I scored