VG20E is your best bet, they can handle 500hp boosted and are much narrower than the DE heads of VG and VQ not to mention slightly more compact design than the VQ.
I know its a cast iron block alloy head but they are a gem of a motor, look old skool and easy to source without the need for excessive wiring or bracketry built onto the more complicated vq20de. Also heaps of after market parts for VG and easy to put tripple downdraft IDF, IDGs or sixtuplets of modern R1 41mm or honda 48mm bike carbs.
Otherwise you can go injection from factory or downdraft TB holley injection very cheap unit
manifold mods
http://forum.britishv8.org/read.php?6,24633
http://www.the510realm.com/viewtopic.php?f=10&t=24019cheap holley TBs
cant go wrong with this price!!!
http://www.ebay.com/itm/Holley-TBI-Th ... 0394B-TDC-1-/291106236893http://isuzu.off-road.com/trucks-4x4/ ... body-injection-20276.htmlVG20e even stock sound good
http://www.youtube.com/watch?v=kRT0wqqxwv0looks good!
http://japanesenostalgiccar.com/wordp ... sun510-NissanBluebird.jpg