[fordracer]

Thanks for all the excellent replies. I already kinda figured MR valve sizes would be too big . Not to flame anybody here but I know my power goals seem a little high but I am used to driving a mid 11 second Mustang on the street. My mental picture/ dreams of a Cobra has to be faster than that. My Mustang was 2950 lbs with 400 hp. I figure a Cobra realistically weighs 2700-2800 lbs , so I am going to need 475- 500 hp. I'll probably go with a 428. Again guys thanks a lot for the help.