I have 355 HP zz4
I have not decided on heads or cam
Any recomendations for cam amd heads
ZZ4 is a GM crate motor, about the same as what I have, just you need add DPFI of some style to it, but ZZ4 comes with aluminum heads I HEAR they are same as the L98 heads #113 casting......my cam is slight warmer than ZZ4, but along the same lines really, my engine was built some 11+ years ago and so precedes the ZZ4 availability by several years.....
I think that with my 200 4r automatic I built myself here in the garage, and the 336 rear and '92 vette rims 17x9,5 with 275/50/17 rubber in rear, 255 up front, that I get 22.222 mpg at 90 mph cruise, it's not so awful evil as i'ts supposed to push nearly 400 hp.....
I do wish I had less cam for better fuel economy, but then I'd have to drop it down a good bit and dunno what to do then....
not going to save enough fuel to make it worth it, is my conclusion....
so your ZZ4 cam is perfect, IMO....