if your not seriouse about riding, then just grab a stock crank and put back in there. theres other mods you can do that will give you more power without spending 500 bucks on a crank.
you can probly get a used tock crak in good condition for 75 bucks.
as far as your head goes you can either buy another stock one and have it milled or buy a coolhead and get smaller domes.
again you say your not that seriouse, id go with a stocker thats milled its cheaper then a coolhead.
buy your self some vf3 reeds and an adjustable timing plate and some pipes like toomey t-6 and you will be set.