Originally Posted by RATTRAP

I would drain the water from the radiator re-fill with antifreeze, run the block to temp and store for the winter, flush it in the spring.

I agree. With the water pump running, it will mix the new antifreeze and the left over water in the block. So don't use that premixed antifreeze.

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1