I would like to change my 81 920rh to 1985 virago 1000 cylinders & pistons that i have available to me. Can anyone tell me if i can do this and use the 920 heads, will there be any clearance issues? the 1000 uses a regular paper & metal gasket, this seems like it would be thiker than the metal o-ring gasket on the 920. Any comments or input is appreciated.  Thanks, Bob Druge