I asked Van's the same question a few months ago. I can't find the email right now but the RV-6 engine mount and cowl are no longer available, RV-7 items must be used. A 6A cowl could be used for a 6 (cut lower corners for the gear) but not the other way. They didn't have a list of parts required. There are a few differences that may not have to be changed, such as position of the brake pipes on the firewall. The must do parts (engine mount, gear, fuselage bulkheads, tail wheel bracket) have already been covered.
The shipping costs to this side of the Atlantic killed the idea, in the end I found a 6 to buy and sold my 6A.
Pete
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