[ROVERNET - UK] SD-1 heads and plugs

[geffandjulie]

I have SD-1 heads on my 70 3500S. Based on Rovernet advice, I changed the 
possibly incorrect short reach plugs for the supposedly correct BP6ES long 
reach, gapped to the correct 0.025".  It won't idle or run.
Are there multiple types of SD-1 heads?  Could I really need the short reach 
plugs back in?? Thanks!
Geff and Julie McCarthy
AvMedSafe
503-241-8468