Let me give you guys an idea of how easy and affordable the big block engine can be. Dad's Thunderbird weighs 2950 with him (160 lbs) in the car. We use an .080" 429 SCJ block (4.440" bore) with an offset ground stock 460 cast crank (4.140") to get 512". The crank is turned down to BBC rod journal size so we can use an off-the-shelf Eagle 6.800" h-beam rod and an SRP flat top piston. With a stock block/crank and machine work we can build these for under $3000. With a set of Blue Thunder heads (not anywhere near as good as the CJ or the Kaase P-51) that are bowl-ported, an off the shelf Comp .750" roller cam, Victor intake, 1150 Dominator, and 2" headers we have gone as quick as 8.94 at 149 mph. This is with a 'glide, 4.11 gear, 29.5 x 11.5 slicks, and ladder bars with a mini-tub. Stock chassis too. This thing is basic and dead reliable. He leaves on the transbrake at 4000 rpm and shifts at 6500 rpm. Been in the car for five seasons with over 500 runs and still shows a 96 percent seal on the leakdown. Now....change the heads (and pistons to match) to Kaase P-51 and this car is an 8.60 / 155 mph ride. Add up the cost of a fully forged 4.6 with ported heads and a blower or turbo system and you are about $2000 more than an intake-to-pan 512" engine similar to Dad's setup with a set of P-51 heads. You can use an aftermarket Eliminator block and forged crank for some added insurance but it really is not necessary. Kaase did a 466" engine with his P-51 heads and a street roller cam that made over 700 hp. Never went past 7000 rpm either.