I need advice for a good street performance/economy slant 6

Hi everybody. I am having to learn about slant 6's as my ex's 64 Dart is broken down in my back yard, and I need to get it out of here as it is blocking the entrance to my back garage where all MY toys are. I have alot of experience on SB's, none on a slant 6.

We are going in two phases. One is a 49 k original mile slant 6 to bolt in and go for now. Meanwhile, we want to rebuild another for better street performance and economy to be swapped in later.

I have a 66 and 67 slant 6 along with a 64 slant 6 with a piston through the side of the block to scavange off of. We are looking for improved performance without sacrificing too much economy. What combinations should I be looking at?

I'm thinking of running 9.0 - 9.5 compression, double roller timing chain (if I can find one), performance cam (that still gets good fuel economy). What combinations have you tried, and how happy were you with the results? I have a very good head guy that can port my head and add hardened exhaust seats. Which year head would be the best to modify? Should I have him install bigger than stock valves while he is at it? I have read an article that stated the slant 6 responds well to opening up the bowls in the ports. My head guy is great at that.

I know there is alot of potential in the good ol' slant 6 (the leaning tower of power), I need your help and advice to get it out. :rock:

Thanks