I have the 195cc Patriot aluminium heads upgraded with bigger springs and 7/16 studs. Awesome heads for the money but if you got the cash go with the AFR heads.
I have a 270H Comp Cam(08-420-8) with 1.6 roller rockers puts my specs at: .533 lift, 215 dur at .050, and 110 LSA.
I bought my heads, rockers, pushrods from
whiteperformance1 on Ebay and had great customer service.
I bought the cam & lifters locally.
I only have 100 miles on the new motor so not sure on mileage. I'll give her 500 miles before standing on it but there is a bunch more power on tap than the 350 had.
1999 K1500-Int balanced 383, 10:1 pistons,534 lift cam,6"rods,alum heads,1.6 roller rockers,welded alum valve covers,MPFI conv,HD built tranny,custom ECM,HD posi 3.73 gears,13"rear disc,headers,Flowmaster SUV50,highflow cats,drilled/slotted rotors,HID headlight,LED running lights,305-50-20 tires.