So here is the deal. I have a nice 72 RS/SS that has a nice running little 355 that works well as an around town fun weekend car. The TH350 is due for an overhaul so I am thinking of making a little cam change. Motor: 9.7:1 compression 4 Bolt main block AFR 195 heads (older heads not the newer eliminators) RPM Air Gap Quickfuel 750 vac sec Comp Cam XE268 Mid length Header 1 5/8" headers You get the idea. I am thinking that when I pull the tranny I will pull the engine to fix a stubborn rear seal leak. I am thinking I may swap out the cam for the Comp Cam Magnum HR280 to make better use of my heads. How much of a benefit do you all feel switching to this cam or one similar would be? I have had this car for over 30 yrs (drove it in high school) and every 5 yrs or so I get an itch.