I'm replacing my solid roller cam in my 508. 4.250 stroke 4.360 bore, compression ratio 12.11 Edelbrock RPM heads Intakes flow 308 CFM, M1 4500 flange, 950/4150 Ultra XP., 2" pirimary tube TTI headers, 727 with 8" PTC converter flashes 56-5800RPM, 4.56 gear, 14 x 32 tire, weight with me in the car is 3378 lbs. 71 Cuda Race only. I spoke to 3 cam manufacturers. All 3 recommended similar cams.

#1 310/318 adv. 279/287@.050 .713 lift at the valve with my current rocker 1.67 ratio 109 lobe separation 31* between advertised duration and @.050
#2 314/316 adv. 278/287@.050 .708 lift at the valve with my current rocker 1.67 ratio 106 lobe separation 36* between advertised duration and @.050
#3 308/315 adv. 308/275@.050 .733 lift at the valve with my current rocker 1.67 ratio 108 lobe separation 33* between advertised duration and @.050
My current cam is 306/273@ .050 .694 lift at the valve with my current rocker 1.67 ratio 108 lobe separation 33* between advertised duration and @.050

With the current cam the 508 made 645 HP @ 6000 RPM and 643 Tq. at 4900 RPM and went as fast as 10.03/132 through the exhaust.
My question's are what would be recommended for the Lobe Separation based on the small cylinder head, the weight of the car and the converter stall and any other variable that I may not be thinking about?
My second question is how does the ramp speed affect the way the cam act's. I think the slower ramp is a little easier on springs etc.. Is there a good reason HP/tq. wise to want the faster ramp speed?
This is a footbrake bracket car.
Thanks