A nice grind ,yes .They run a full billet cam core.That doesn't normally work,
without a bronze gear. The Howard's is a drop in. I spent some time,on this subject. Ask,before you order....
I can understand the difference between the mani's and the shorty's. If you decide to go long tube, I'd guesstimate a extra 15hp and 25 lbs ft to go along with what the Howards or Comp provides.
Any HP/Performance gain will be good to me. I have people changing motors, buying race cars, and doing everything else in the book for my little 318. It's time for me to step it up also.