There's a lot involved and it depends on what you want to do.
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1 complete front 5 bolt conversion
For your 73 you could:
Purchase drilled 914 rotors - $295.00 (you'll need new bearings and seals)
Purchase 911 Struts - $350-$500 plus depending on how complete (brakes, cool strut inserts, new rotors, new bearings)
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2 complete rear 5 bolt
Again, depends. How much work do you want to do yourself.
914 Hubs drilled to 5-lug $135.00 (you'll need new bearings at least)
911 Hubs - $150 +$400-500 for 914-6 stub axles if you buy right (you'll need new bearings as well.)
Complete bolt on 5-lug conversion arms $395.00 plus your cores (includes new bushings and bearings).
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3 BOTH complete 5 bolt
Minimum - $295 + $135 = $430 you do all the work and you'll need bearings, seals and rotors.
Medium - $350 (or more) + $135 = $485.00 and you'll need bearings, seals and probably rotors all the way around.
Medium 2 $350 +$395 = $745.00. You'll probably need from bearings and bushings and the rears will bolt right on. You'll probably need rotors and possibly brakes.
Top End - $500 + $650 = $1,150 again, you'll probably need bearings, seals and rotors and possibly brakes.
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4 porshe 5 bolts (rough/generic price)
Are you talking about wheels? Plan on $100 each to $200 each depending on what style and size. 914-6's came with 14" fuchs or 15" steel as a "general" rule (yes, there where various other Mahles and Pedrinni's etc.). The 14's were fairly easy to find for a while there and they could be had for $50-$75 bucks. I haven't seen them much lately but I haven't been looking.
A nice one might be the very common 16x6 that came on the front of most 911SC's. Most SC guys moved the 7's on the rear up to the front and got 16x8's for the rears. 16x6's (Fuch's 5 paddle) are still fairly common and the 16" size is still fairly easy to get a tire for. 15x6 is also cool and frankly, for any tire that will fit under a teener, they can be found easily as well.
Hope that helps.
Eric