That order is fine, but if possible do the heads, and cam at the same time. And do the throttle body, and intake manifold at the same time to. Trickflow makes good stuff, but there are better parts out there. When you change the cam you will need to change the valve springs. Its a good idea to change the push rods and rockers to. You can buy a whole cam upgrade kit that has everything you will need. Actually, you can buy a whole top end kit. Heads, cam, intake, valve covers, springs lifters ect....The trickflow kit sells on summit for $2100. Its a good way to go, because you know everything will work together ok, and you save money buying it as a package. Also you are better off just doing it all at once. You did say you dont have the money to do it all at once. But you may be better off saving up and getting it all at the same time. The only other thing I recommend is upgrading your fuel injectors. When you start flowing more air, you need more fuel. I have a few things forsale you may be interested in. PM me if you want.