L98 350

Heads: good design can be ported fairly easily. Post 1986 they will be aluminum.

block: cast iron 4bolt mains strong. A good starting point.

Crank: The Vette Crank should be forged steel.

Rods: Cast stock 5.7' length.

Pistons: Hyperretectic, stronger than cast not nearly as strong as forged aluminum. Static CR was 9.5:1

They were rated at 245 horse. The big impediments to this motor making power was the stock throttle body and the upper\lower TPI manifold. Most peole change them out and get 300 hp down. This cam be expensive if you go with a setup like the Stealthram or relatively cheap if you convert to a 4bbl Carb and intake. Stock internals with headwork and s a cam intake swap and you should be able to put down 350+ hp and run deep in the twelves. You can get a rebuild kit from Summit Racing Equipment for $400 or so and pay an extra $150 I think for stage II rods and have a short block that will hold up to 600 hp.