Larry, you really need to chat with Todd Knighton as he's done many of these conversions on Varioram motors. This is where my knowledge ends as I have no experience with those motors.
You'd probably need a Protomotive 993 ECU for a Varioram motor to take full advantage of that capability... Todd is your man
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition