360 questions

With a 360 under it, it won't much matter what smallport singleplain you use; but since you have it,
it is my opinion that
a small port Street Dominator, on teener heads, on an approximate 9/1 cr 360, with 3.73s, and a van convertor,will be seriously big fun, from idle to 4000ish, which will be 35mph in first. With the 727 ratios of 2.45-1.45-1.00, the rpm drops between gears are; to 59% and to 69%.So outshifting 1st at 4000, the engine will drop in at 2360. This will then require a 4000 - 2360 = 1640rpm powerband.So now you power up to 4000 in 2nd to 58mph(just about perfect! Outshifting 2nd at 4000, the engine drops in at 4000 x .69 =2760; a 1240 powerband requirement. Then powering through to 4000 in direct will get you 84 mph at 4000 again.Of course with the right valve springs, there is no reason to suppose your combo won't continue to rev well into the 5000s, which would get you about 105mph@5000.
Here's the kicker; your cam better not be designed for high rpm operation. But you will know that soon after the first start.
As to the valvesprings, I had good success with putting 360 springs on my teener valves with .060 shims at all locations.Bush league I know, but it revs to 5500 easy enough with the stock teener cam, headers, and a smallport TQ. I leave you to check your valve gear out, to make sure all the parts play nice together.
Just do it and tell us how awesome it is!