Another 273 to 318 swap questions

67dart273 is correct. Exhaust/Headers are the biggest problem. Layson's has the "spitfire" style headers available. I don't know if Harold is making them for Laysons, or if they are copies. I have both the standard style, and the engine swap style here, just for comparison. There is no "cheap" available, other then the stock 273 manifolds.
And yes, I can supply the bushing. They are in stock, and can ship, USPS Priority Mail. Delivery is usually 3-4 days, from payment.