Im on a tight budget after all the upgrades I recently did to my 67 Dart. Therefore I thought what performance upgrades could I apply to my 67 383 formula s at minimal cost. The original 383 engine as far as I know has never been apart and has great compression and uses very little oil. I was thinking I could swap out the factory 516 heads for the 915 heads I took off my dart. Then upgrade to an aftermarket aluminum dual plane low profile intake. I was thinking top that off with the carter 750 cfm that came on the 67 manual trans 440 and transplant my tti headers I had laying around. I think that may be good for about 30-40 horse. What does the peanut gallery think? If that seems like a good move then I would need to purchase a good performance intake for this application and preferably a low profile dual plane so I could put the original air cleaner on and fit under the hood.