Brodix RR vs. GM stock big ovals

[Bandit]

I just ordered a set of Brodix race-rite heads for my BB Chevy 402. they have 115cc combustion chambers and 2.25/1.88 valves. The plan was to gain 50-70 more hp. Now I see that my current head casting #'s are GM 336781 and by all accounts the best open-chamber 454 open-chamber large oval port head that GM made. My 454 heads have Manley 2.19/1.88 valves.

I am not changing out pistons, I have Wiseco 5039H6 with a +38cc dome.

So should I send these Brodix heads back or keep them and install them? Am I going to gain any power with the same CR or not? If not, then I don't think the new heads will be worth it. For me, the $1850 won't be worth it to save 50lb of weight, if that's all I'm getting out of these heads. I mostly drive on the street.

If anyone has experience with a swap of this type and has an opinion I would like to hear it please.