Lakeeffect's 69 Valiant

I am running a 474 lift purple shaft. Does anyone think i am losing much hp with this cam?
home ported 360 smog heads
340ci/.20 over
KB243's 9.5-1
391's
Ld340
Headers
750dp

I want to upgrade to Eddy heads soon. i figured i would have them gone through and just smoothed out.
I LOVE the sound of my cam. soo i was thinking 284, .528 purple shaft in the mean time or would this hurt me till i got my heads?