Well the nice 292 exhaust manifold is 170$ and the shipping to BC is ...wait for it...190$.

I looked at the exhaust on the integrated 250 I have, and it's not bad . In fact it looks pretty good- split two 1 7/8" down pipes y'ed into one 2 1/2" back.
The intake manifold gives me the willies. Sort of like small toilet bowl internals.
To put bigger valves in it , I would get a core and saw the intake off the head and weld some piping to hold three fuel injectors with a log style throttle body.
Maybe do the lump mods [12bolt.com]at the same time. ps not the lump but the rest.
Dont want to mess with the existing head- too new.