It appears you have "updated standard" grim long with 28 restricted cards as follows:
Grim Long
A Vintage deck, by Stephen Menendian
4th place at a StarCityGames Power 9 Tournament tournament in Chicago, Illinois, United States on 2005-10-30
As reported at
http://www.starcitygames.com--------------------------------------------------------------------------------
Maindeck:
Artifacts
1 Black Lotus
1 Lion's Eye Diamond
1 Lotus Petal
1 Mana Crypt
1 Mana Vault
1 Memory Jar
1 Mox Emerald
1 Mox Jet
1 Mox Pearl
1 Mox Ruby
1 Mox Sapphire
1 Sol Ring
Creatures
2
Elvish Spirit Guide (more) Cabal Ritual1
Xantid Swarm Empty the WarrensEnchantments
1 Necropotence
1 Yawgmoth's Bargain
Instants
1 Ancestral Recall
4 Brainstorm
2 Cabal Ritual
4 Dark Ritual
1 Hurkyl's Recall (-1 card)
1 Mystical Tutor
1 Vampiric Tutor
Sorceries
1 Demonic Tutor
4 Duress 3 Duress (-1 card)
3 Grim Tutor
1 Imperial Seal
1 Mind's Desire
1 Regrowth
1 Tendrils Of Agony
1 Time Walk 1 Frantic Search1 Timetwister
1 Tinker
1 Wheel Of Fortune
1 Windfall
1 Yawgmoth's Will
Lands
4 City Of Brass
1
Forbidden Orchard Urborg, Tomb of Yawgmoth4 Gemstone Mine
1
Underground Sea GlimmervoidLegendary Lands
1 Tolarian Academy
New Restricted Cards:1 Crob Rotation1 Chrome MoxSideboard:
1
Chrome Mox (moved to main) ???1 Mox Diamond
1 Tormod's Crypt
1 Darksteel Colossus
2 Elvish Spirit Guide
3 Xantid Swarm
1 Seal Of Cleansing
1 Abeyance
1 Chain Of Vapor
2 Hurkyl's Recall
1 Balance
If your goal is to find an optimal grim long with at least 30 restricted cards I do not believe you succeed by weakening the manabase and swapping time walk for frantic search. You will not have enough land in play to make frantic search worthwhile, and time walk is very strong, especially with ETW.
I suppose Chrome Mox and Crop Rotation might well be the best previously unused restricted cards if you want to bring the count up to 30. Crop rotation has been in previous incarnations of the deck, and chrome mox has at times had a sideboard slot (as in the list above). Cutting a Durress and Hurkle's Recall make as much sense as anything if you must do this.
You realy should make room for a chain of vapor--it will be missed.
I too question the value of this exercise.