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

krazykuda said
I'm thinking of running 9.0 - 9.5 compression,

Both block and head can be milled to get you close to this. While upping the compression ratio will improve efficiency, it may be necessary to use higher octane fuel which is sufficiently more expensive to wipe out the savings created by the higher compression ratio.

krazykuda said
double roller timing chain (if I can find one),

Cloyes makes one. There's a guy over on Slant6.org that does group buys. I got mine from him.

krazykuda said
performance cam (that still gets good fuel economy).

According to the Mopar Six Cylinder book, the 72 and later stock cam is considered a performance grind. There are occasionally group buys over on Slant6.org for a Sig Erson. Last I heard there had been some unforseen circumstances of delayed delivery. Comp Cams makes a pair of bump sticks. Neither is very radical.

krazykuda said
I have read an article that stated the slant 6 responds well to opening up the bowls in the ports.

You and I must be reading the same stuff. The Mopar book has some porting templates in it as well that may be of help to your machinist.
As for heads, suggest the 72 and later heads because they have the hardened seats.

Recommend switch from points to electronic distributor. The factory version or Petronix work well.

Good luck