being a Jensen you probably don't have a ton of hood clearance so you may want to look at the Indy 440-2D dual plane (sits lower than a performer RPM or a Holley Street Dominator.
.
.
... Hydraulic Roller in the ~236 @.050 duration and around .540-.565 lift and I would run about a 110-111 spread and put the intake centerline in around 106-107.
.
.
... If you wanted to you could go with a similar intake duration and a much longer but also slower exhaust ramp