use what ever bolts you got that will fit.
and the tb vac line, thats routed to the right place. i guess you used the old line off the n/a tb. if that fat hose there is leaking not tight, cracked, it can cause that surging, and could be whats leaking when you spray the tb area.
you can get a new fat line, like 3 inches long, then take the new vac line from the evap solenoid., and push it inside the fat line.
this is how i fixed my fat line when it cracked on me. fat hose to normal vac line to the hard line. on a sc car, the evap lives on the rear of the engine on that bracket you posted a few weeks back.
