1965 289 that we freshly rebuilt. Bored .40 over. Mild flat tappet cam I posted the cam spec sheet. Apparently its unusual specs. Edelbrock 600cfm carb Weiand stealth intake 8020 Comp cams Roller rockers 1.6 Stock heads as of now and stock exhaust. Stock straight 6 c4 auto and stock rearend plan on upgrading both in the future. Hopefully they make it there. I plan on upgrading exhaust after I save or do they need to be done at the same time so they match? Iv heard good things about the afrs 165 and 185 iv heard of 75-100 horsepower gain almost sounds too good to be true. but not sure which one I should get or if the afrs are right for my setup, maybe edelbrocks would be better being cheaper? My current stock heads are pulling studs so time to upgrade. Also will I have to worry about porting aftermarket heads? Or can I get them already port matched? Thanks. There's so much I don't know yet so I'm learning as I go.