It needs a dominator size carb. Some guys made good poop running an adaptor on a good 4150 manifold though I personally have no experience with adapters. A 1.80 first gear or a second gear TB will make the shift point more presentable. As in, it will actually make a big difference. The 727 was not my friend in this area and shift points had very little effect. I think peak power was about 6,200 or so. Generally, with my dyno tuned 493 with a flowed BG 1050, ported Edelbrock RPM heads and a .660 solid roller the car would run quicker shifted at or below 6,000. I've seen 7,400-7,600 at the stripe with a 4.29 gear and 32"-33" tires. Converter went to 5,900 on the stand. The car went 1.24 60 and 9.24@145 with this 727 setup at 2,600lbs in sea level, high barometer conditions.