alum edelbrock heads

You would be waaay better off IMO to bump up the Scr with zero deck or better pistons, and leave every thing else stock, than to leave those pistons down in the hole, and thumperize it.
Sure you will gain a wee bit in Scr with the smaller chambers, but with the Eddies sucking heat out of the chambers, and with the thumper stealing Dcr,the net Dcr will be so low that the bottom-end torque will all but disappear.You might gain a few hp after 4000 or 4500, but getting there will be LAZY, and just where is the bulk of street driving done? Certainly not above 4500rpm. Unless you put a hi-stall in it and some gears(more money),Lazy will it be. Sooner or later you will be so frustrated, that the pistons will find there way in there, or you will go crazy. Why not just get it over with now.

Heres a ferinstance;
New pistons .005 out of the hole with 5cc eyebrows, Stock iron heads with a clean-up cut,.039 gasket,a 262 cam with the intake opening set to 55*ATDC. This works out to about a total chamber volume of 80.5, and a 10.2 Scr, and a 8.2Dcr. This with the .034 tight quench will smoke 295s for a very long time.
Now lets work the Eddies;
pistons down .125 no eyebrows,aluminum heads at 65cc, same .039 gasket,same 262 cam, same 55*ICP. This works out to a TOTAL chamber volume of 99.5, a Scr of 8.45, and a Dcr of 7.23, but wait the al heads suck another .5 to 1.0 out of that, so that might leave you with as little as 6.5Dcr. That is out of the gate LAZY.
So, those attractively priced heads, with the stock pistons under them, will do nothing but slow you down. But you are welcome to prove the math, and prove me wrong.