Don't get me wrong here , as I DO run nitro's , and lots of them , but there are a few more things to consider when getting a nitro that big ...
1) does the idea of dishing out around $30.00 for a days worth of running sound appealing to you ? because that 90 ( and this is a single mind you ) will suck uop a LOT of nitro , and I DO mean a LOT .
2) Do you have a strong enough starter or plan on making/buying one ? ( bought , they are BIG bucks , not to mention the battery )
3) with that size hull , and a ZENOAH , you could probably run ALL day on about $5.00 worth of gas , and have no need for the super high torque starter , OR the battery ( as for the 90 nitro )

Again , don't get me wrong ... I LOVE nitro engines , but just trying to show you what you would be in for , if you ran a LARGE nitro in that .
( besides the constant tuning , verses the gasser , which , when set , is set ... no need to change dialy/hourly as with a nitro . )
And as Ron said ( which I agree 110 per cent ) .... all of what you asked , depends on a LOT .... setup , which motor , what per cent fuel , what prop , so on and so forth ...

Also , can I ask , what kind of speeds are you looking for anyway ? ( hopefully , not like those sellers on EBAY and are trying for 100 or more .... )