Last night I was running top speed at about 4000rpm for ten or fifteen seconds. The only mod I have is I tuned it for 93 octane, the motor has 130,000 miles. The motor lost power and started skipping bad. I got it home and there is oil all over the chassis, water in the oil also. I work at shop, so I'm going to put it on a lift monday. I have searched for some short block options. I thought I should check here and see what route you guys went. I plan to do a complete engine build and try to get 400+ horsepower. I'm also going to build the transmission while I have the engine out. What is the best combination of parts and possibly aftermarket heads for this project?