J-head to eddie swap?

What the others are saying is true for you, 63. On a mild combo, you will lose going to a bigger and better port, and a chamber designed to have the piston very close to it, as opposed to down in the bore with a dish. I'd keep the 1.88s, and have a good porter do a little work. A lot of good work will get expensive, and on yours, isnt needed. The first $200 you spend on porting gets the best results. The rest comes on a sliding scale, the more performance, the higher the cost. There's some debate about whether or not spending the $$ on aluminum is "right", "excessive", and "a good deal". But the end result is, you need a head that fits your budget and will work to get the goals you want. On some, factory iron can work. On others, ported iron will work. But a properly matched engine system will work the best. I've never seen a car lose power going to aftermarket heads. But I dont install them where they are not needed, or straight from the box. Also, I have seen plenty of engines with aftermarket heads not make the numbers they should. Who's to say why. My experience leads me to doubt it's just the heads.