just bought a 66 coronet 440 with a 318 wide block, i want to get the most power out of it. anybody have any tips. possibly bore to a 340 and stroke it. I also tried to do some research on the heads that are on the motor now and the numbers on some websites are saying they belong to 65 426. head casting numberes are 2268341 and the block casting numbers are 2468230. thanks for any tips or help.