There is a Tartan 34 group on facebook that gives a lot of help on mods and repairs
. If you can find it on the net, there is a much older Tartan 34C forum that archived lots of technical information and very good information on modifications. I havent sailed mine yet, but since it is a Sparkman & Stevens design and won a lot of ocean races when it was new, I think it will sail just fine. The A4 information will be found on the MOYER MARINE
web site. Some boats have been converted to diesel
but it involves raising some of the seating around the dinnet. Most diesels are taller than the A4. Over the production years the rig was changed a little (shorter boom). Some say it was to reduce weather helm
and some say to fit the changing IOR rules. Owners state that weather helm
can be fine tuned with the center board. They seem to be under priced for what they are and project
boats go for very little, but as I often remind myself THE PROJECT
BOAT CAN BE THE MOST EXPENSIVE. For that size range/price and age, I dont think you can go far wrong. Good Luck, ____Grant.