Changing my stock350 heads &cam

OK guys. I'm new at this blog thing so bare with me.
I have a stock 86 c4 350 engine. I'm changing the heads and cam Dart aluminium 202/160
And the cam is is crazy going full roller I don't have the full specs on the cam at the moment but I'm pretty sure lift is 502/510 duration is your 210/235 it real close to this I'm sure. And the heads of course are ported. What kind of power am I expected to gain? And how long will the short block last? I'm thinking of stroking it to a strong lower 383 . But for now I'm just going to do the top end unless u guys think I'm going to explode my bottom end. Please give me your thoughts on this.
Thanks.

Has your bottom -end exploded yet. :-) How did the heads and cam work out?

I have a 95 year model 350 with a full stock bottom end. I have a set of Patriot performance 64cc 202/160 heads that are ported and polished and milled 5thousanths with a 562/580 Comp roller cam. I haven't had any problems so far. I rarely drive the car but when I do I. Get down on it often.