Blackjacks vs. Powerbombs

I have a 98 SJ with the following mods
5mm stroker
Ported cases and cylinders
ADA head 175psi
Type 9 dry pipe (water injection)
v force reeds
Riva reed spacer
Riva intake manifold
x prop re pitched by impros to 14/18 and cut back 3mm
MSD enhancer
Shredmaster intake grate rideplate combo
TBM pump cone
I have a set of 46 Blackjacks on the way from Art. I just wanted some opinions on what people thought about these compared to the Riva Powerbombs? I have had 44 blackjacks in the past and really liked them. But I have had a set of 48 Novi's and really liked them also. I have also heard good things about the Powerbombs. Just looking for some input.
Thanks
 

nikad58

1974 YZ 701
I like 44 black jacks..I've ran all but full spec.. the BJ 46's are hard to get right..(for me) i think Art says they work best jetted at 1/2-3/4 turns out on the top.. I just didnt like that little of adjustment for the different places I go (sea Level to 5000')
 
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