340 Performance Question

Hi guys I've got a potential buyer a 340 engine I have, and the member is asking what kind of performance numbers should be expected. I was expecting to make between 350-400 HP from the build.

Since it's never been ran, I wanted input from some of you folks more engine savvy than me, to make sure I don't over promise:

It's a 72 340 bored .04, with the stock 1.88 heads. Heads were cleaned, mag, valve job, surfaced.

Springs 100# a seat, 240# @ .460 lift.

It's got the following:

• Keith Black Performance Pistons - KB243-040 Hypereutectic pistons
• Mopar Perf. ''Purple Shaft'' Hydraulic Camshaft Kit: Camshaft, Hydraulic Flat Tappet, Duration 268/272, Lift .450/.455
• 1.5 Rockers
• Ede RPM Performer intake manifold
• Summit Racing 850 CFM carb

Thanks for any insight guys.