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I believe that the cube recipes available to classic would be any that are marked as 0 for their version, in cubemain.txt. The total list available are:
Staff of Kings + Viper amulet -> Horadric Staff
Khalim Flail + Khalim Heart + Khalim Eye + Khalim Brain -> Super Khalim Flail
1 Wirt's leg + 1 town portal book -> portal to cow lvl
3 health potions + 3 mana potions + 1 standard gem -> full rejuvenate potion
3 health potions + 3 mana potions + 1 chipped gem -> rejuvenate potion
3 small rejuvs -> one large
1 perfect gem of each type + 1 amulet -> prismatic amulet
1 ring + 1 perfect ruby + 1 exploding potions -> garnet ring
1 ring + 1 perfect sapphire + 1 thawing potions-> cobalt ring
1 ring + 1 perfect topaz + 1 rejuvenation -> coral ring
1 ring + 1 emerald + 1 antidote potions -> jade ring
1 axe + 1 dagger -> throwing axe
1 spear + 1 arrow quiver -> javelins
3 rings -> amulet
3 amulets -> ring
3 standard gems + 1 socketed weapon -> magic, socketable weapon
3 flawless gems + 1 magic weapon -> socketed, magic weapon
1 magic small shield + 1 spiked club + 2 skulls -> shield of spikes
4 health potion + 1 ruby + 1 magic sword -> sword of the leech
1 diamond + 1 kriss + 1 staff + 1 belt -> savage polearm
1 strangling gas potion + 1 health potion -> antidote potion
2 arrows -> bolts
2 bolts -> arrows
3 chipped amethysts -> flawed amethyst
3 flawed amethysts -> standard amethyst
3 standard amethysts -> flawless amethyst
3 flawless amethysts -> perfect amethyst
3 chipped rubies -> flawed ruby
3 flawed rubies -> standard ruby
3 standard rubies -> flawless ruby
3 flawless rubies -> perfect ruby
3 chipped sapphires -> flawed sapphire
3 flawed sapphires -> standard sapphire
3 standard sapphires -> flawless sapphire
3 flawless sapphires -> perfect sapphire
3 chipped topazes -> flawed topaz
3 flawed topazes -> standard topaz
3 standard topazes -> flawless topaz
3 flawless topazes -> perfect topaz
3 chipped emeralds -> flawed emerald
3 flawed emeralds -> standard emerald
3 standard emeralds -> flawless emerald
3 flawless emeralds -> perfect emerald
3 chipped diamonds -> flawed diamond
3 flawed diamonds -> standard diamond
3 standard diamonds -> flawless diamond
3 flawless diamonds -> perfect diamond
3 chipped skulls -> flawed skull
3 flawed skulls -> standard skull
3 standard skulls -> flawless skull
3 flawless skulls -> perfect skull
6 perfect skulls + 1 rare item -> 1 low level rare item
1 perfect skull + 1 rare item + soj -> 1 high level rare item
3 perfect skull + 1 rare item + stone of jordan-> add 1 socket to rare
3 chipped gems + 1 magic weapon -> socketed, magic weapon