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Most economically are Holley 1850's.. 600 cfm vacuum secondary carbs. these are closest to the original, no longer produced, read really expensive OEM 550's 650's and 730 cfm factory carbs. Original rebuildable OEM Holley's aren't hard to find, but good used ones are. NOS examples have been found for $500-700 each without linkage, fuel log or air cleaners.. The 1850's are everywhere new for $239 USD. www.jegs.com
Think about what we are talking about though.. 1200 cfm.. Even a 427 cubic inch engine spinning 6500 rpm at 100% (not possible) efficiency only needs (read, can only digest) 735 cfm.. 900 cfm is 19% overcarburated.. 1200 is almost 40%.. I am not saying you can't use 1200.. but enless you are turning 9000 rpm you will never use all of it.
Other options include two holley 450's or even 390's.. Both the 450's and the 390's do not have a choke, which might be a problem in Canada, eh.. 
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
Last edited by SCOBRAC; 05-12-2003 at 09:21 PM..
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