A mostly stock 5.0 doesn't make much power past 5k,top end starts to give up, so for me now with stock heads, I limit it to 5k with a msd 6al.  The reason I chose the trickflow street is that it should make more power than stock from idle to 5k. And after that it will make more power than stock. Also $379 is better than $550. So far I'm like the trick flow street. Maybe someday I'll switch to something else. 
		
	
		
		
		
		
		
		
		
		
		
	
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