RGGR, I don't see anywhere in this post where Venom300 asked his choice of build to be lambasted and I really don't see any need to criticize so harshly.
Anyway,
You don't have to use an Ibanez neck (although it would be easier if you could find a cheap replacement on ebay) but what you do need to make sure of is the correct scale length, unless you want an overhaul.
The pocket size and neck screw configuration can always be adjusted, although this isn't always straightforward, but as long as you're confident you can do the work...
If the neck pocket is too large for the heel of the neck you purchase you can fill the pocket with a block of wood cut to the dimensions, similar to installing a set-neck but without the neck, then you can re-route the pocket to the dimensions of your neck heel.
(I must emphasise, accurate measurement is the order of the day here, measure again and again until you're double sure)
You could also glue shims made of wood into the pocket, you see this more commonly with acoustics that have had neck re-sets.
A quick google brought up this link, although personally I wouldn't use this technique
http://www.angelfire.com/music2/construct/page1EOM.html
Also, take a look over at Frets
http://www.frets.com/FRETSPages/pagelist.html#Luthier
You'll find plenty of good advice there, aswell as here on the site and forum.
If the difference is extremely minimal (which is more likely) then a few coats of lacquer on the neck heel or thin veneer shims may do the trick.
If the pocket is too small then simply route it bigger, again measure, measure, measure and make sure you're fully aware of your centre line.
If the neck has pre-drilled screw holes in it you can open these up a little more by using a larger drill bit then glue in dowels and trim/sand flush then re-drill your holes to the required placement.
I'm not 100% if the 270 has the AANJ neck joint, if it does you can shape the heel of your replacement neck accordingly (providing there is enough material to work with) by using tools such as a rasp (and rifflers), surform and sandpaper.
The best advice though is don't be put off.
If you want to have a go at it then have a go, just make sure you understand the steps involved, take your time and get a few practice runs on scrap wood under your belt.
There's plenty of reading material on the net that can help you with your venture.
All this is academic though if the neck fits snug!
As for the pickups, it's a lengthy debate.
It all hinges on what sound you want to achieve but I would suggest worrying about the pickups later on, they're not important at this stage.
Best of luck
wwood