Why bother with 327 rods? They are almost the same as the 6 cyl rods, same center distance and same size rod bolts, and overall not really much stronger. Even the so called Pink Rods everyone was hot over for a 350 were only regular rods that the factory stress relieved. Of course the 350 rods are for the larger journal crank.
If you are thinking you might gain some added rpm because of a shorter stroke over a 250 it won't be worth all the effort unless you go with light weight high dollar rods and pistons as well. The only reason I can think of to build a smaller or odd sized motor is to be targetting a long forgotten class record at Bonneville.
On the other hand we inline guys like to do things others don't and if you have all those parts around and want to use them in your engine then I say have fun. What size and surface track will this run on? Is it a short track with almost no straightaways, or a longer track? The bull ring will require a good handling car and a smooth responsive engine. A long track will need plenty of torque to pull off the corners and still not run out of wind before the end of the chutes. Handling can be a tiny bit less critical on a longer track but not if you are running a 6 banger against 8 cylinder cars that get around better than you. I'd build the biggest engine that will meet the class rules in both cases and then cam it accordingly.
Mike
