I'm looking to make some more power out of my 79 flat tappet cam, carbed 351w that is in my 67 mustang. I'm looking to make around 500hp. I'm hoping to achieve this through heads, cam, intake etc. I'm over whelmed by the amount of data and tech behind selecting the correct heads to match a cam along with the correct pushrods, rockers etc. knowing heads are going to be the most expensive my budget for heads is around $1,200. I understand that this kinda limits me but things can be bought in stages. so what are some of your combinations or recommendations.