Mine is an auto 512 street car, BUT I had 3.54's for a long time & the car ran ok, 4100lb 11.04 @ 123, then went with Stack EFI & still sorting it out,,, fuel delivery problems, that said I went 4.10 & it made it VERY happy just cruising the streets, the 410 is MUCH better for drivability , I have Caltracs, split monos, & sliders , & had MT Radials 325-50-15 R, now I have Hoosiers Radials, with a stick shift I would say go Bias tires ,, I forgot to mention I do have an Overdrive A518