Dave,
It will depend on what you want out of the motor, if you want just bolt on's then a twin carb set up (matched carbies), extractors and a little cam will give you a nice workable motor. If you intend bolting on the tripples then you seriously need to consider the rest.
A motor with tripple SU's ie: lots of fuel, needs to be fed a lot of air and needs to get rid of gasses efficiently. So you will need to consider a good head job
with over sized valves, port work to allow gasses and fuel to flow well, good mid range cam for a steet driver and good exhaust system and .... it all = $sss I run tripple SU's on my grey with 100 RWHP, but horse power on any motor has a direct correlation to the dollars you may need to spend
regards
Weddo