Iron Ram heads on a 340???

A friend has a stock 1973 340 and is interested in putting some Iron Ram heads on it. He was wondering about how much power and torque he would gain with the 1.92 valve heads or the 2.02 heads from Hughes. His car is stock otherwise. It's more of a cruise night car that might see a track a couple of times a year at the most.

I told him I would run it past you guys here since I have no first hand answers for him.

He might swap the cam to a XE262 Comp Cam to help gain even more cylinder pressure and it's more aggressive ramps.

Your input would be great. Thanks.