bbc
The 4.86 to me is a bit much. With a 4.00 stroke and that gear Your starting line ratio is killing You. For 1/8 mile with Your weight I think 4.30s would be the most I would put. Ran a 468 in a 2150 lb. roadster with 4.11 and ran a lot better than that, and this was a 1/4 mile car. I also had a 5800 converter, You may not be that far off. Good luck.