There is the Voodoo 10200701 256/262. Just stuffed one in a low compression boat 1978 Magnum w/360, a Weiand Action+ intake, 750 Street Demon(yes a little too big but it’s what we have for now) Patriot 1-5/8” headers, 2-1/4” full exhaust, Hughes 2500 stall and 3.21 gears. Still shaking it down tuning carb and timing, but has a barely noticeable lump to the strong idle. And fwiw, it pulls and accelerates better than it ever did before. Car has some balls now