Here is my dilemma. To build a high horsepower Mopar or any engine for that matter you need a good foundation. As of right now there are no iron aftermarket blocks available for Mopar. You can get an aluminum Indy or Keith black (2 year wait if you are lucky). Cost around 7500$ once machining is done. I have a Koleno block in the boat now. Extremely strong, still at 4.5 bore which can safely go 4.6. Koleno is no longer and will not come back. Good heads and rockers for Mopar, 10K to make power. I have a 68GTX in the garage that really needs the boat engine so I am thinking at the end of this summer pulling the Mopar. I am thinking a 565 Chevy build for my boat. Between Billy and I we have a good used 4.25 crank. 6.8 scat rods, used isky roller 283/292 something close to that. I have a Pro systems SV1 carb on the wall. I can buy a tall deck 4.590 Dart block for around 2400$. Heads I am thinking of buying a Brodix Headhunter 383 CNC package. It comes with CNC ported heads, single plane intake, T&D shaft rockers. Diamond pistons your choice of compression. Arp studs, gaskets, and springs. About 7000$ with 2.375 titanium intake valve upgrade and 1247 triple springs. I would still have to round up engine plates, headers, bellhousing, oil pan. Think I could do it all for around 13K to 15K and make power close to the Mopar in the boat now. Just thinking out loud but thought I would throw it out there.