The .528 seems to be a very strong cam. I guess my thought was running a four speed like you I could go with a bit more cam. Not sure if I left something or not, but it seems strong and it has a great sound at idle. I am also running it through manifolds Will have to wait until this summer to get it at the track for the first time and see how it performs. The one I chose was an off the shelf comp cams extreme energy hydraulic flat tappet. Rpm range 2,500-6,200/Advertised Duration .285 int .297 ex/Dur @.050; .241 in .247 ex/ Lift .545 in. 545 ex with 1.5 rockers. Lobe Separation Angle 110.

You are getting good advice from experts I am not one. Just thought I would offer my choice on a mostly street driven car that is a blast to drive.