I think that is the most cost effective way to go for a race engine. Especially if you have the right converter and are geared to keep the engine in the 6000 to 7000 rpm range all the way down the track.
Are you going to stay with the 4150 or change to a Dominator? There are Max Wedge intakes for both 4150 and 4500 carbs, but the 4500 setup will make more power. Only issue is that then you'll need to buy a good 1050 Dominator.

Most cost effective way to go would be to buy the 270 heads with the roller cam springs so you're ready for the new roller cam. You'll have to swap your existing flat tappet springs into the 270 heads for now. But then when you're ready to switch to the roller cam you'll have the parts you need.