I think either one will work for that purpose...but imo the Vmax engine will hold together better than the Doo 780 ( assuming that's what's in it )....go onto the 2 stoke side of TY and pm YAMMIGOD3:16, he seems to know Vmax 4s very well.
I use to own a vmax4 and I always lost to the Mach Z. My fastest was about 115mph while the Z was at 120 on ice/hard pack..my buddy with the red vmax4 kept blowing his motor up with pipes and porting.. That said the Z's also had reliability issues. My stock 4 was bullet proof. I enjoyed the Srx 700 much more though..if you can find one of those..that would be your best choice. Some reed valves a d roller clutch works wonders on it..122.8 mph is what I saw.
Your Crazy not to build the Yami v-4. much better motor than that poo doo! YOU CAN GET A BUNCH OF HELP FROM VMAX-4.COM. Bunch of great guys willing to help. JUNK THAT 780 PIECE OF junk!
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