I have been tackling the issue of parts for the last couple of weeks for my 230 build. My machinist is fine with me sourcing parts. He was upfront with me to the fact that when they source the parts, they usually do a 30% mark-up. I started with VPW and worked my way through the suppliers on line. VPW seemed to be the most expensive. I found Egge to have the cheapest prices. ( Terrell machine was comparable). I went to Oldmopar for water tube, engine mounts and welsh plugs. Prices vary with individual parts, so you don’t have to order the “kit”. You can pick and choose parts and then order cheaper individual parts from somewhere else. Be sure to ask if the part is in stock, which will delay your order being shipped. I believe these shops reach out to other suppliers to complete their kits and they don’t always have the parts in hand.Of course, the more individual orders you have, the higher your shipping cost. A few things to think about.