With what you got gear stall exhaust etc.. and if you want to stick with comp cams xtreme energy line I'd be looking more at the 250 or max 256 one's or similar from other companies.
I ran a comp XE250H in a 318 with some ported closed chamber truck heads, headers & twin 2.25" exhaust, weiand action plus and a 625 Carter Afb. Stock convertor, 3.23 gears, it was a nice little motor for crusing around.
Not fast but a reasonable bump up from stock.