Those are not complete man. They are heads, valves studs and guide plates only.
The Marine heads do not come complete. All other Performer RPM heads do though.
And..... I have tried a dozen times to buy those from Flatlander. They have NEVER had them in stock.
Funny how Summit has them listed as complete and assembled as well, but E-brock lists them as without Springs.
I wonder what "assembled" means in Sparks, NV???