Hurlbird, if your Icon is your car, it's a beauty. Oh-nobull is the closest on track for you in my opinion. But let me throw in my experience and advice. Nothing is as simple in the doing as it is thinking and talking about. Retrofitting a V8 in place of an Inline will create all sorts of unforeseen issues. I assume that your car still has it's 6 lug hubs and knee-action front suspension. It will be enough work to just clean up the brakes, install new shoes and turn your drums to have a car that can make sure safe stops in modern traffic. To improve the get-up and go and be able to stay up with traffic it is easily obtained by substituting a later model Chevy 6. A 235 is a direct bolt in if you save the front mounting plate from behind the 216's front timing cover. You can use the original bell-housing/rear motor mounts and transmission. For rear end ratio, get a set of 3.55 gears from Patricks in Az. This will be all you need and will keep it very stock looking to all but the most discerning observers. Savvy Inliners are pretty rare. If you are looking for more speed and performance, find a 261 from a 2 ton Chevy truck or school bus, 62 or earlier. There is no substitute for cubic inches. Ross makes a hi-compression (pop up) piston for 235's and 261's. They can be bored as much as 3/16" and will yield 287 cu in. With their 3 15/16" stroke they make torque that will shame a 283/327 small block. Down the road there are Fenton headers and plenty of multi-carb manifolds to increase the performance even more. Delta makes a nice 243 degree cam that will really wake up a Chevy 6. Even with the extra power and 3.55s you will be spinning the motor pretty fast for a long stroke motor when running with the cars in the fast lane. The solution for you car is to install a "Truckstell Overdrive". They were made as a dealer installed option for 47-54 Chevys. They bolt to the transmission U joint ball and attach to the shortened torque tube via an adapter. Then you will have final gearing of a modern vehicle and can run close to 90 at 2600-2700 rpm. Check out my albums on my profile page where you'll find Semi-sweet my 54 GMC with a Truckstell and I can knock off 41 second miles at only 2600 rpm for mile after mile. Best regards and good luck with all your endeavors, KB.