Summit Cam Help/Recommendations

Gotcha.. With the 360 you have more cubes and a longer stroke so that is a step up in the low RPM torque department over the 318 anyway. Moving in the right direction IMHO.

The issue with these older cam profiles is that they have longer advertised durations and that will decrease the low RPM torque; overdo it, and the term 'dog' at lower RPM's becomes applicable.

The workaround then becomes raising the stall speed of the torque converter so the engine can rev up when starting out (like revving the engine extra high each time you start out with a manual trans).. some people like that, and for drag racing that is all fine..... But that does not meet my view of 'good driveability' and things like fuel mileage suffer.

To avoid those compromises, what you want to do is get more lift to help breathing, but limit the increases in duration to the minimum, to limit the drop in low RPM That is where wyrmrider is pointing you. These older slow ramp designs don't achieve that. With a few more $$ in the cam department you can get there.

The Lunati Voodoo designs can be had in 256 or 262 advertised durations with the same lifts.
Now that gets to valve springs.... which you have mentioned in the head work.

The one advantage of the old style slower ramp cams is that you may get away with the stock springs for a while. But even with those, if you rev it up, the valves will still want to float at some point. With a cam like the Voodoo, you're very limited to RPM's with stock springs (maybe almost useless), so a spring change is pretty much gonna be needed. But you are already considering a valve spring change anyway. So that cost does not sound like it is a barrier. Yes? No?

Backing up a bit for the heads... since your use seems to emphasize low-to-mid RPM operation, I personally would not be spending money at a shop for any porting work.... if you are not running high RPM's a lot, it is not going to be of much benefit. Put the money elsewhere. If you want to port, do some mild work yourself; there are a lot of good threads and advice on that here on FABO. Do that before taking the heads to the shop... just in case you cut into a seat a bit!