I recently grabbed these from an old dealers attic. My research shows them fitting various 70 and 71 383 and 440 low performance applications. The right one fits LP 4 barrel 440's. I am not sure if this is a pair ordered for the same job or not. The right has the computer card with number 2899954 which is the actual part number in my book. t has a casting number of 2899876-3. The left one has a casting number of 2951861-5. I found part number 2951860 in my book. It is probably the actual number for the left. I am asking 225.00 for the right with heat riser and 150.00 for the left. If you want both I can be flexible. They are both definately NOS and just have some light surface rust here and there. Shipping will be actual cost and I can use my FedEx account to save you some bucks. They are really nice logs.