Brian
Thats good you have a 351
Have you looked at the Ford Parts book lately?
It seems that they have some iron heads the N-351* & N-352* bare they are $375.00 ea Retail. Don't remember the chamber cc's but thats an easy fix, with 2.02 & 1.625 valves this should increase your top end considerably, if the cam you are running is correct.
But a cam is cheeper than the heads so over the winter you can change it to see.
Lunati 51012 HYD Roller 292-232-340 Int & 300-242-350 Exh W/1.6 .544-.560 They grind it on a 112 I've run them on a 106 - 108 with no problems.
Next up = 301-242-376 Int & 311-252-370 Exh Same here 106 to 110
Next up = 311-252-370 Int & 319-260-370 Exh Ditto
XE-274H Extreme Energy cam
Int 274-230-.324 Exh 286-236-.326 on 112 W/1.6 518 & 521
Want more top end with your heads put that 252-260 Lunati Hyd Roller in it - Have it ground on 108 LSA.
Denny@JDS Induction Products