What hp and torque am I making?

In think stock 1.88 J heads will support 400 Hp as will stock 2 1/4" duals. Flow on stock heads stall out around .480 lift so bigger valves or new heads won't help flow but may give you a bit more compression.
Here's Comps own XE268 dyno test using a 9:1 sb Chev 355 with nice Dart heads (i know) and I think more guys would like the XE262 it appears slightly better everywhere!
You have a real nice street engine as Rusty says!

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That is picking the fly poop out of the black pepper picking between those two cams. :)

I would choose the XE262 if buying new out of those two as well for a low compression street motor spending most of its time under 4k, but would also just run whichever one I had on hand and not worry about the small difference.