From what i've heard
I think around my parts a lot of guys angle mill the heads to say 18 degree or possibly 15 degree, don't know anything about it but they tell me it makes a lot more power. I think you can sneek in Comp rockers that look stock but are a lot stronger maybe 1.6 ratio? Also don't quote me on this but i believe Scat might sell a stock appearing rod that's much stronger than stock think around 250.00.
Good Luck!