I am going to be getting a set of Holley Systemax heads to go with my Trick Flow Street Heat intake and stage 1 cam. Will my stock injectors and fuel pump be ok to handle this or should I upgrade? I will also be installing an AFPR. Thanks for any help.
I suspect you'll be right on the edge with the 19# injectors; you will totally outrun the stock fuel pump. If it were me, I'd upgrade the pump with the head install; and then I'd drive it a bit - a dyno with wideband to check a/f ratio would be ideal - to see if it seems like the 19's are holding you up. 24's would be plenty with the properly calibrated maf.
The 19's are going to be right on the edge of not being enough and a bigger fuel pump is needed.You can\t get a pump that is to big so get as big as you can afford without going overboard.Make sure you have a fuel pressure regulator so you can dial it it.