10-11 second combos with hp weight gear ratio

I used to have a 360/380 hp crate motor in my D50 and it ran a best of 7.27 @ 95 in the 1/8 at 2950 lbs. The motor is a stock 360 Magnum. I think it is 9-1 comp. stock Magnum heads .501/.513 Hydraulic roller cam. It had BAD exhaust on it. They do not sell headers for a D50 so it had 1.5 in. block huggers with 2.5 in. collecters with 3 in. Flowmasters. I think it would have went alot faster if it had normal headers on it. I think that is in the 11.40 range in the 1/4. I built a 394 ci. pump gas small block and put in it and went over a second faster and 15 mph.