I'm not sure what the duration is on that UD cam, but if you have an honest 11.4cr, I'd be looking for it to be in the mid/upper 260's to go along with that 5000 stall.

As for the OP heads, I've never dyno tested unported 906's with stock valve sizes vs 2.14/1.81 installed. I'm sure someone has done it, or done some in car testing, but what I have seen is that the flow numbers don't really suggest that the 2.14/1.81 upgrade is the hot ticket unless at least "some" blending is done.

My first 11sec combo, circa 1986.
440 with pistons .055 down the hole, home pocket ported 906's(when I bought a flow bench years later I tested them and found they flowed just under 240), racer brown stx-19 on a 105(in at 103)bought it at a garage sale for $20, original torker, 850 Holley, hooker 2" headers, Fairbanks 9" converter($200 at a swap meet, it was new), 4.56's, ss springs, 5/16" fuel line & pick up(original), mech fuel pump, flat hood, crank driven w/p, full interior, wipers, heater.
Went 11.60's at 116.
Swapped the cam for a crower solid that was like 248/254-110, in at 106, ran much "nicer", went 11.50's, but lost 1mph...... Went 115.