My 2-cents,
Those springs should be OK if the seat pressure is still as advertised.
I would gear for keeping the RPM below 6800, especially trying to control the valves with 1.6 rockers.
My "extreme" flat tappet springs would be 150 seat, 440 open. But that is starting to push things for durability on the lifters.

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