Holley 390CFM carb. and linkage

Looking to buy a Holley 390CFM carb. and linkage for my '68 slant six Dart. I have gotten a price of $500.00 and $70.00 in that order for the parts. As I am in Canada and these are Canadian prices, can anyone in Canada recommend any other places to look (before I buy) or maybe someone might have one or the other around (and not using).
Lastly, what part number is used for the linkage (I believe it's Lokar) and is it a north south (front to back) application or an east to west (side to side) installation?
Thanks & Cheers..... Paul
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