Whatever works for you Peter..
Just remember that race engine parts are good for a finite and unknown number of cycles.
If these rods are new and not just rebuilt (Cycled) rods - you may be in pretty good shape if you can get the whole assembly to balance correctly. Heavier rods require heavier crankshaft counterweights. If you have to use Mallory-Metal to balance the crank, you'll be spending some pretty hard cash.
Here's something else that may interest you;
eBay Motors: NOS Gurney Eagle heads with Boss 302 short block (item 220083036777 end time Feb-25-07 14:54:30 PST)